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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45b53113a6c7f3f269881db74c8eef004130aa840e558dcd0d6450268fe6f660' 
  AND token = 'f5g56z8dqSRJ/jw+wKwdSg1Ri8tMl41kHhiVkTc6bQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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