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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b56f6dcd8e0b4fcc4259590c11f0ecf84f1428e1879a0d60c05a3d73d6df1a18' 
  AND token = 'GqI9oUp28JWsRq+Ofw9CmOt8+R3NOMbMh2pPUkPC9oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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