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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6dc1ef7b989a9f9b28d9c6a895190d5a232409cba904dd8a111166bb26eea3cf' 
  AND token = 'y+AxCeSUZpMiRPGg5BC2s2Op26elZ5R7JWsb/+g1Uo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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