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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58559ad72297bee9bff809c790b7d58b75f484f5447072b4587a7be675e49ee5' 
  AND token = '6T9HUVOAgl4K1JneL9hpkqzlxPw0K9NsJ682IgdxLDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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