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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a65ed4f971ee7eae8d8ee9fc7d9e8aba08985980ad9d25973921bf69919f02b9' 
  AND token = '7LxvPGsILkGqBRAG4toSA4GqT7H6QS7mVmhNI720czU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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