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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a41bdc7973078fcf3d9eb294f1add954fdd8b8f6d9d4338cacebf420e59cf4d' 
  AND token = 'MKP779YBtIAPAzpWz9iwVksjHmJhnZAKUVeX3Ks4yP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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