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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a1cbe4cf5676e1ba7a0359089d1d8eaf3029cf1d2bd4bf80cde8e4a73d97035' 
  AND token = 'r39ptdIxxYqjcAOdfvWEnxIOIRBznZQ76uyrX191wzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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