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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4e35ce9a48bd4d6658ff0b47e2da355c4f675250018bf8ddb548c283c592c32' 
  AND token = 'WcY0W2CL55zs4mu5s2107jFc92MUhU4aLD+ww/fRllI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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