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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a37c4bb335b1061ff7e04088cb2f4eb0e366915fbd6ebf97a4d336ee7a8a730' 
  AND token = 'nct4SQMxZnuDY5nIebUP9n9H5PzpM8o7j/OiNFzgnLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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