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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1b9c674960dc7ccbe2b7631f635d884aeca34f3cec02c8c2a72afcb8ca24f6b' 
  AND token = 'pzDCqnE6ELPXghuz6bjY36cbHdjTcsaQwremWLypB44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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