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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e07303b1c6d1956d59ab2e3845355233ebdfc892192bd69018dd3702f71a11a6' 
  AND token = 'xIsZ69iJSxgc0d2VBDuQgiIH6xp0DRp5+0S9gm8zyCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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