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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81ae52e991ba4b76bb21f010ef1f13afdbcb5d3281d3598ccb74c8e30810cda7' 
  AND token = 'oq5ulW3jQ989rtf79YJu6s+yYkJOs4/rbJogrl+LhPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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