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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e0e97ea80add74d1ade6b18b5ca05d5681608fc991ba8f5617e23baddf6d88b' 
  AND token = 'UPi4al3AyJotasfHlDRoc4xz1e4m7eIuHKcW4Tah9cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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