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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45b3fbfbaf8e1dc4a635aeac4afaf4e5f8ec865d160b25cd2467cf1ba4839bb5' 
  AND token = 'hkK09eCNfhQ6AxU4d3fGm7rB2awKWsc26nh/5vTEI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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