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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a862c669ab3d5fa35ec0d1c600159c33208ec08c065fca1a824331defd30716' 
  AND token = 'KeiEI501i/cKA/2sDXH+vI9lhm2Hlo6UiJ1CSXo2i4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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