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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1e55fe8e9ea8d76a36f46d57045d92d71566759b7789afad72a07102147d368' 
  AND token = 'naBzOp6caAIY7K3o/zRlC5UkjmchIPUqD2umbdwUNc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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