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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6f4e583eb903f04bbb4930cef7250b3dedbf793a722a088270e20e9b2918de8' 
  AND token = 'HI7Ec8U3X1YwzzUD4Dasf1T6nbFjfUQdU7AVm3YPBNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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