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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd3463ecf06eb2fce66a809d3c17892ebee2a75bb5893be1c5c30b5b7b00e70d8' 
  AND token = 'V9Zwrnjv5k12v6BI0l0N9WUDqbG2yRP7xt4N8Nfo+hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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