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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2e03de00312e61bf4541412e0e82e551fd203c0123603322b791edc6bec9714' 
  AND token = 'HvgWZEHmBIWyMjFTieHbMVpx5BmrPi2rSS/TN5gcuqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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