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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9f033ed6717f33c809d42852331d97057f60931d16c2fa545e3bb85f20944b9' 
  AND token = 'ZUjyjNFgiC0old/yk7KX7p0WvLcv5xiQRVAD3pl0HO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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