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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce239de79901b3fb80ee7bb2e84bd282b03fb8d870be86cf4de02104fd07d944' 
  AND token = 'LmU1gR//nhS9LuKwF1eKfKhAjqUL3svZ63aQDSsifyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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