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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '523db572c62ada8af6a522fc52193a58d95f6cfdf42199876a055824133fb7d5' 
  AND token = 'ynCmUoqSA5UGDFMX1/3YXR/XJSZ4W79CdjSJGQU5fqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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