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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'edb0041b4510bb11ef26d70ae54966362c8ad7b8779fc7d76bb765c34c3c3756' 
  AND token = '+syjtEADNSuCjaIL4A8E65BEJXbmD5bjDdJqC6H+WEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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