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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c12a6a8984e2e18883d48686d04174050cc3cbeb6b8203b004ff472e727a1dfe' 
  AND token = 'wblO5ZgpEeeFAxOlIJBajs56YO1yR8KptOT2/SkgUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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