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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fdaa79bf5c6d8d02c025e242273103aaf48bdf986e93f70b15a691f625afd184' 
  AND token = 'dqq1SIbZqH3UpACceqZmdasbYm6GNDHnuoF1/1d/d0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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