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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d8d9f0bd12b7347a8ae6a47f62cacf4fd34c02621a41219685e05f0eb69e1f8' 
  AND token = 'LNTNRwtP9osDNON4lshhU9dCdb2WZ3mlB29r4u1crNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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