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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7847e0e53e85cb07ad6be62eb148b6fdb8c19bb55804c852aad32ff529d10c57' 
  AND token = 'kcu62q4t5uRQzcWtMxNkpH3/2x3N1mUGT/Ji9l+U9UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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