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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b87217b595ba77e42974a610a2f31f27952768efb335128ba58b458c63276923' 
  AND token = 'bMYKZjXTODeTRER9mhbpXlw/R1nSCbMbTBYybFGftuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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