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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ddc2c2957c89e01f252b1afe819f6c29c94fb854508da343b0a426b0b1918100' 
  AND token = 'l6unonWXgLra4csa6f3kwjNo3lWH/zls3+BlmJDljws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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