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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e09b66364c1438d556a7f933bfef23ef86f5518f8b11d70d12503ca2bab7c69' 
  AND token = 'xfSaZ0okS0IcKO4u850TeZNZtrwEPS2QV04nzLh7CpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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