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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7779397f4f3039c04bb6c6ee521eadad22d823ab9c99341bd67b0b9c607e1313' 
  AND token = 'TimzSIZbikqbaJrFHSNH+gif+4O9/oHZdyrTmCfe/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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