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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45d039db98f7a5a9224866a4b33656bc65cf05e7db63c2ebd20d419f16bd42eb' 
  AND token = '74C+91r3SSI+jr0YGxxeM4fxbR7eENUnKrZq5B7AjN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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