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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '776412d585c18b93c2ba6021560e01afa115cd6af44d52fe5766a34ac8126c6a' 
  AND token = '9MbhPJ/Trn23/CxuBkA+4myxEBK/dUv4t6l4l/Ro5UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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