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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1931d41c8d582d21b7eb0ad1dd155eeef6852aac1b6fedd124192572e1ecb07d' 
  AND token = 'aMCL1o/PK1hzOuBA9xBN5ZlqEcuzJ69qIYzAhHSur7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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