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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91cb3d77d2f77c6157a135ded5e4b4eb46bd4a34256224b706a7a5b73c329da9' 
  AND token = '16O2Bn8GYpSbTc3DTEcajOLR9GMF6Yg6O+ry90jwXVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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