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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f39fe2efa5662fe605e8860d438af62c8fc712bf8b8e01025c8a82aa53570da9' 
  AND token = 'jm2pAEAj1tqobsKz2G+1xYoNa5Us4WBvGPjaPKCErSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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