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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1490c5bc139abe7fb0090e2cdc7ca031f5e221fcae1bc9956f038f123d57aa10' 
  AND token = 'NiRR+0bxRVBZ9yzjJ2NarJO882+QjyeiePbQNPG89s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}