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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd19de4b92b80d80dd0bed66fc67fb8d7dd93b1f5256ebf662ccea7040ae8501f' 
  AND token = 'UYBaSJya6RSJlYPxMJFQ2vv5PCboQe06eorYw3q5jA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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