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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9a75256c28916d19adbb4d5594cb0b51b2a4c11cf427cb1ff45b9c11415876b1' 
  AND token = 'jAZ9kwJvL6DEhNgfcevQQCgXcQ+FyHvNMWO2rKuPSDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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