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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93fbfab7429df553227d6195eff20dcb9ac9af79cbb3724e2fe2e74c719ca7f4' 
  AND token = 'I/RfeQvo7IJXe2vPYRLhI+4JjJN+9IswL1rTCdSgd5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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