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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b3c123684590667a4cac2d5b86a6ce6e45ab5c357e259d6fc6496ec977d203e' 
  AND token = '1vctTtEvbih3M9pqugRTxKfv75CK0u7EQ/I6DC5U0dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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