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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '799ff0f612e15b4370eba28a8e9a108dd0e3889122e11c797fd5b38537bc01f6' 
  AND token = '0OEbSH0t0uccIRddz0+iGFQzr7SR//JCOlsu35ObA8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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