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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27d30d40d771e70b3dc280d8f412653c9a33e26635ce8dfaac16b89d2232fba4' 
  AND token = 'RPsYR9d7Kptc6pkgKC50B9OK8E94MODRbku26zbpCpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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