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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b72d839bc200c43f20843a6b076561c09aa914e59f125aace4eac8cd09e9442' 
  AND token = 'vd9EjBo0ffwaELVd07uJ7Hu8XilgN+m2MCSdBZij5g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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