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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f76b98ec7d8df33bcf727bfee6c87b672bf740b8b372b4896c129a15b33e533e' 
  AND token = 'iYEpH1jbyG+Qa8uYFDbi7sP0Al33/7RkNVifpt2f9Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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