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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd93d09fecea9e3a4b6e225e7b1f969022f954f27b372b0a10e1bf49f8280fc21' 
  AND token = 'CeP1OyIUzb1dE8wzsEyR4X2uxEbfGz0Fnin6TUv9Y3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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