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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e769b219338cfd9392df288eb2906e44766b8c1fac6948f2cea06fc8e5850876' 
  AND token = 'hlGN9Nf+2i/6Hm5aZ/ggoNffT3e3Ta9SYl65qQMv4Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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