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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d1d0d2e43e88c63373633aebc4eb0dad4a56a0fbf2f64692bcdc348ea3ede17' 
  AND token = 'bNqpjZ9fRwvK9HdGywXHvMt35x9hX6wVdlr/a71hryA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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