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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05578020cf8c577b0e6f1b339f9ad4e3028227f22bc9634b8dd33cda04cbdc1a' 
  AND token = 'o3vdBvAb6a6BBFpTzzWcsB2q4rwbMeAg9Tqcl83z9wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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