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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6fa339350aad4af7db14089384ec87985b1ffb3de114d94bb9c06c516f8aa3ea' 
  AND token = 'LALNnH+5bcHKaf7TmTxU6Md9ypQ9JroZqYy/X6JAqR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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