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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43758b044e5a3891b807e20e7a5c1aee5a9238eaf9fd11a909d0a3c18274a66a' 
  AND token = 'KbPxI88IGuERnobpUo15IXKmTllGz3g7kiRzr3LHZCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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