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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f6cd0d32e65245e8583d291eefe2f761a3c86f696d660e8128bce9718fe3e371' 
  AND token = 'nPtfdyHYTEhx+Itmu/QL6Atss4j97fBRnIb18gBQ+Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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