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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3080d4dd9873d161d730f5d55251ca6d1ba0ce9fcd5a061f3d3199b5edb649eb' 
  AND token = '5a/84HqCo3m3qNk5d6z0Rck5c6x1tL4aVJJove7VC1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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