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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c247955cae3076683fb08a74381cfd3ff9e9ad47e46135869b491ced89d5db57' 
  AND token = 'dF1VWKCohaX/vSU5UAcAYInoO2dsSFMBalmQuLtxzHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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