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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1be984719e5e8bcd86d5d7ae46b651320b68bde41fdc7b8e67fdaaf9a2b26d69' 
  AND token = 'MN0inzZqcE4FzKsr0MmAqXejCaw0w/dRiHcnPh418YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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