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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58ac7282f1e850fbe4ca337727801a02d0077e2f106378707a9d63e69e1d3184' 
  AND token = 'hfdPFdYrvivob+J2uiCq01eS3ENwAERrghq5UZFzynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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