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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc7ac5267e44da96827651562f546b3cc8120ea446d0b305148622c8eece10af' 
  AND token = 'mgZ6gic06TcL9iAGrz62yT4Cmbr0yEUEDVXqHMPYZCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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