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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '729c16d61819ca6fbe7b180a8bbd2d676431b600f0beb29097aa0191c3f26ec3' 
  AND token = 'uxX5ZTWrKYVVuAfnmOfhrE8wpiILDb3illptW1o4/yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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