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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5af53082ffcea9a2ca744b82624113ffe25ca03fc6a6260efc055a936700839f' 
  AND token = '4EPKiSBGagsh8tSzMuOEHHNStXYg8o9/Z9W4aj1/ol8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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