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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30c8a4ff3240ff153abb48f079025a728fcd8d6ed67ab8a0f34b34dea34f1c9a' 
  AND token = 'RU0HjFSWH8pr1Fj3TypDVpxny+wdu8OzuPj/ERb+cSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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