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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8725ccf19444bb08e7f1f9d3e43ee03e59c1554f63219a7b8625c1c593c28d59' 
  AND token = 'OFjEdIFUWHP640M65LYTplwQITJCmxRYxr6INzi2VUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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