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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ecbcc0374084f938935b1acd21429ef6313b04e683b210f85efcdb9a3fa5afc' 
  AND token = 'GfKpEtxDAHpK1l0y2u1KXbZzyVxpniu2CD4QKjiG6x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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