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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea416a8739bc686983d0a17cbc035a18b74550f0631ca3cb3586f6db7ff3013b' 
  AND token = 'dUTAFAsu69tD2CQ5UVIS2CCqZb2NOlMLxe18t/7YHIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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